Giant magnetostriction is achieved in lightly Tb-doped Fe83Ga17 melt-spun ribbons. The average perpendicular magnetostriction λ⊥ is −886 ppm along the melt-spun ribbon direction in the Fe82.89Ga16.88Tb0.23 alloy and the calculated parallel magnetostriction λ|| is 1772 ppm. These values are more than four times as large as those found in binary Fe83Ga17. The enhanced magnetostriction is attributed to a small amount of Tb entering solution in the A2 matrix phase during rapid solidification. The strong localized magnetocrystalline anisotropy of terbium is thought to cause the giant magnetostriction.
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Wu et al. (2013) studied this question.
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